#建立数组
import numpy as np
list1=[[1,2,3],[4,5,6],[7,8,9]]
arr3 =np.array(list1)
print(arr3)
arr1=np.zeros([3,3],np.int32)
print(arr1)
arr2=np.ones([3,3])
print(arr2)
arr5=np.empty([3,3])
print(arr5)